Answer
Vespasian ruled as emperor for 10 years, from 69 to 79 AD. He ascended to the throne after the tumultuous Year of the Four Emperors, bringing stability and prosperity to the Roman Empire. During his reign, Vespasian implemented numerous reforms, including the construction of the Colosseum and the establishment of the Flavian dynasty. He is remembered as a capable and effective ruler who restored order and prosperity to Rome.